My daughter is crying a lot lately and i don't know why may you know why?

Hard to tell: The best thing to do is have her checked by the doctor. Babies don't know how to tell us what is bothering them. They can have an ear infection, a tummy ache, a pinched area (clothing too tight), be hungry, wet, dirty, tired, have an injury, or just need more attention. If it is happening frequently, get her checked to make sure it is not something that needs to be treated.